Okay I know SOHC vtec is nothing special but I also know it's not suppose to make your car slower when it kicks in. What can cause this? Incorrect timing? exhaust manifold too small. I just did a mini-me swap d16y8 head / head gasket + d15b7 block + tranny p28 chipped ECU AEM adjustable cam gear d16y8 timing belt i removed the oil jet plug from the block.